OpenSea - Ebay for cryptogoods. Buy and sell items on the blockchain.
Enveloupe - Send snail mail in three clicks.
NFT Scoring - NFT Scoring tracks and analyses all NFT projects.
Felt for iPhone - Handwritten cards for the modern world
Rarible - Create, sell, collect digital items secured with blockchain
Skip The Stamps - Snap or upload a pic to send a physical postcard in minutes